JP7383553B2 - Cement-based filler - Google Patents
Cement-based filler Download PDFInfo
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- JP7383553B2 JP7383553B2 JP2020064624A JP2020064624A JP7383553B2 JP 7383553 B2 JP7383553 B2 JP 7383553B2 JP 2020064624 A JP2020064624 A JP 2020064624A JP 2020064624 A JP2020064624 A JP 2020064624A JP 7383553 B2 JP7383553 B2 JP 7383553B2
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- 239000000945 filler Substances 0.000 title claims description 64
- 239000004568 cement Substances 0.000 title claims description 37
- 239000002002 slurry Substances 0.000 claims description 77
- 239000010440 gypsum Substances 0.000 claims description 17
- 229910052602 gypsum Inorganic materials 0.000 claims description 17
- -1 calcium aluminates Chemical class 0.000 claims description 15
- 238000001879 gelation Methods 0.000 claims description 15
- 239000011575 calcium Substances 0.000 claims description 14
- 229910052791 calcium Inorganic materials 0.000 claims description 14
- 239000003638 chemical reducing agent Substances 0.000 claims description 12
- 239000003607 modifier Substances 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 7
- 238000010998 test method Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000011161 development Methods 0.000 description 16
- 230000008439 repair process Effects 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 7
- 238000009415 formwork Methods 0.000 description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000004606 Fillers/Extenders Substances 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 239000013585 weight reducing agent Substances 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 229910052925 anhydrite Inorganic materials 0.000 description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- OWEGMIWEEQEYGQ-UHFFFAOYSA-N 100676-05-9 Natural products OC1C(O)C(O)C(CO)OC1OCC1C(O)C(O)C(O)C(OC2C(OC(O)C(O)C2O)CO)O1 OWEGMIWEEQEYGQ-UHFFFAOYSA-N 0.000 description 1
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229920001503 Glucan Polymers 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- GUBGYTABKSRVRQ-PICCSMPSSA-N Maltose Natural products O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@@H]1O[C@@H]1[C@@H](CO)OC(O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-PICCSMPSSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- GUBGYTABKSRVRQ-QUYVBRFLSA-N beta-maltose Chemical compound OC[C@H]1O[C@H](O[C@H]2[C@H](O)[C@@H](O)[C@H](O)O[C@@H]2CO)[C@H](O)[C@@H](O)[C@@H]1O GUBGYTABKSRVRQ-QUYVBRFLSA-N 0.000 description 1
- 229920001222 biopolymer Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229920006248 expandable polystyrene Polymers 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
- 235000012208 gluconic acid Nutrition 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000035936 sexual power Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 235000000346 sugar Nutrition 0.000 description 1
- 150000008163 sugars Chemical class 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Landscapes
- Bridges Or Land Bridges (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、主に既設トンネルの劣化部補修や橋脚の耐震補強に組まれた型枠内やトンネル覆工背面の空隙部等に使用する充填材に関する。 The present invention relates to a filling material used mainly in formwork for repairing deteriorated parts of existing tunnels and for seismic reinforcement of bridge piers, and in voids on the back side of tunnel linings.
既設トンネルでは、湧水によりトンネル覆工背面部や路盤下に空隙が発生することがある。また、劣化した覆工コンクリートを補修するために補修用型枠を設置した場合には、覆工コンクリートと型枠の間に空隙が生じる。このような空隙部の存在は、車両通過時に発生する風圧、振動等により、トンネル肌面の剥落や型枠を落下させる危険性があるため、車両の運行上の安全面の確保のため充填による補修を行なう必要がある。 In existing tunnels, spring water may create voids at the back of the tunnel lining or under the roadbed. Further, when a repair form is installed to repair deteriorated concrete lining, a gap is created between the concrete lining and the form. The existence of such voids poses the risk of the tunnel surface peeling off or the formwork falling due to wind pressure, vibrations, etc. that occur when vehicles pass. It is necessary to carry out repairs.
このようなトンネル内空隙部の補修としては、空隙部にセメント系材料を充填することが行われており、この充填物としては、セメントベントナイトやセメントモルタルが知られている（特許文献１）。この従来の工法によれば、硬化前のセメント系充填材料を空隙部に充填し、空隙部に硬化体を形成することで、風圧や振動等によるトンネル肌面の剥落や型枠の落下を防ぐことが出来る。 In order to repair such a cavity in a tunnel, the cavity is filled with a cement-based material, and cement bentonite and cement mortar are known as the filling material (Patent Document 1). According to this conventional construction method, unhardened cement-based filling material is filled into the void and a hardened material is formed in the void to prevent the tunnel surface from peeling off and the formwork from falling due to wind pressure, vibration, etc. I can do it.
しかしながら、トンネル覆工背面部の空隙が鉛直方向に広範囲にわたる場合や補修用型枠を鉛直方向に高く設置する場合は、充填施工によって覆工コンクリートや補修用型枠に過度な側圧が発生し、覆工コンクリートの変形や剥落、補修用型枠の落下や破断といった事態が発生する。また、過度な側圧が発生しないよう充填速度を遅くしたり、側圧の低下を待って充填施工すると施工効率は大幅に低下してしまう。このような問題に対処するため、気泡を内包する軽量のセメント組成物が提案されている（特許文献２）が、初期強度発現性に劣るため供用開始までに時間を要したり、強度が低く覆工コンクリートとの一体性や耐久性では課題が残る。 However, when the gap at the back of the tunnel lining is wide vertically or when the repair formwork is installed high in the vertical direction, excessive lateral pressure is generated on the lining concrete and the repair formwork due to filling construction. Situations such as deformation or spalling of concrete lining, and falling or breaking of repair forms occur. Furthermore, if the filling speed is slowed down to avoid generating excessive lateral pressure, or if filling is performed after waiting for the lateral pressure to decrease, the construction efficiency will be significantly reduced. In order to deal with this problem, a lightweight cement composition containing air bubbles has been proposed (Patent Document 2), but because it has poor initial strength development, it takes a long time to put it into service, and its strength is low. Issues remain in terms of integrity and durability with the lining concrete.
近年では、セメント等の水硬性物質を主成分とするセメントスラリーと、短時間にスラリーを促進硬化させる急硬成分を主成分とするスラリーを組み合わせた２液タイプのセメント系充填材が使用されており、短いゲル化時間を任意に調整でき、充填後の初期強度発現性にも優れるため、広く採用されつつある（特許文献３）。 In recent years, two-component cement-based fillers have been used, which are a combination of a cement slurry whose main component is a hydraulic substance such as cement, and a slurry whose main component is a rapid hardening component that accelerates hardening of the slurry in a short period of time. It is becoming widely adopted because the short gelation time can be arbitrarily adjusted and the initial strength development after filling is excellent (Patent Document 3).
このような２液タイプのセメント系充填材の採用により施工性は大幅に改善されたが、充填速度をさらに高く設定して、施工性を改善しようとすると、過度な側圧により補修用型枠の変形、破断、落下といった事態が再び発生したり、それを防ぐためゲル化時間を短くし過ぎることにより充填性が損なわれるといった課題を生じていた。 Workability has been greatly improved by adopting such a two-component type cement-based filler, but when attempting to improve workability by setting the filling speed even higher, the repair formwork was damaged due to excessive lateral pressure. Problems have arisen in that situations such as deformation, breakage, and falling occur again, and filling properties are impaired due to the gelation time being too short to prevent this.
したがって、本発明の課題は、２液タイプのセメント系充填材であって、任意のゲル化時間の調整が可能であり、充填速度をさらに高く設定しても側圧を抑制でき、充填後の硬化性にも支障を及ぼすことのない充填材を提供することにある。 Therefore, the object of the present invention is to provide a two-component cement-based filler that allows for arbitrary adjustment of the gelation time, suppresses lateral pressure even if the filling speed is set higher, and allows hardening after filling. The object of the present invention is to provide a filler that does not affect sexual performance.
本発明者は、前記課題解決のため鋭意検討を重ねた結果、２液タイプのセメント系充填材では困難であった軽量増量剤の使用による混合後の均質性の低下に対して、２液の各々の粘度及び粘度比を特定することによって、軽量増量材を使用しても混合後の均質性を確保することができるという知見を得た。この知見によって、充填速度を高く設定しても側圧を抑制することができ、かつ充填性も良好で、硬化後の強度発現性にも優れることを見出し、本発明を完成するに至った。 As a result of intensive studies to solve the above-mentioned problems, the inventor of the present invention has found that two-component type cement fillers can reduce homogeneity after mixing due to the use of lightweight fillers, which was difficult with two-component cement-based fillers. By specifying each viscosity and viscosity ratio, it was found that homogeneity after mixing can be ensured even if a lightweight filler is used. Based on this knowledge, we have found that even if the filling speed is set high, the lateral pressure can be suppressed, the filling properties are good, and the strength development after curing is also excellent, and we have completed the present invention.
すなわち、本発明は、次の〔１〕～〔３〕を提供するものである。
〔１〕カルシウムアルミネート類、石膏、軽量増量材、分離低減剤及び凝結調整剤を含有するスラリーＡと、セメントを含有するスラリーＢからなり、前記カルシウムアルミネート類１００質量部に対して、前記石膏が１０～４００質量部、前記軽量増量材が１０～１５０質量部、前記分離低減剤が０．２～１０質量部、前記凝結調整剤０．１～５質量部及び前記セメントが５００～２０００質量部であり、スラリーＡの粘度が８５００ｍＰａ・s 以下、スラリーＢの粘度が２５００ｍＰａ・s 以下、かつスラリーＡとスラリーＢの粘度比（スラリーＡの粘度／スラリーＢの粘度）が０．１～５０である２液タイプのセメント系充填材。
〔２〕軽量増量材の単位容積質量が１．０ｋｇ／Ｌ 以下であり、かつ軽量増量材の平均粒子径が３ｍｍ以下である〔１〕記載の２液タイプのセメント系充填材。
〔３〕スラリーＡとスラリーＢを混合したセメント系充填材が、次の（ａ）～（ｄ）を具備する〔１〕または〔２〕記載の２液タイプのセメント系充填材。
（ａ）ＮＥＸＣＯ試験方法３１３に定められたシリンダー法によるフロー値が１５０ｍｍ以上
（ｂ）密度が１．００～１．５３ｋｇ／Ｌ
（ｃ）ゲル化時間が５～１２０秒
（ｄ）材齢２８日の圧縮強度が８Ｎ／ｍｍ２以上
That is, the present invention provides the following [1] to [ 3 ].
[1] Consisting of slurry A containing calcium aluminates, gypsum, lightweight filler, separation reducing agent, and setting modifier, and slurry B containing cement, based on 100 parts by mass of the calcium aluminates, 10 to 400 parts by mass of gypsum, 10 to 150 parts by mass of the lightweight extender, 0.2 to 10 parts by mass of the separation reducing agent, 0.1 to 5 parts by mass of the setting modifier, and 500 to 2000 parts by mass of the cement. The viscosity of slurry A is 8500 mPa・s or less, the viscosity of slurry B is 2500 mPa・s or less, and the viscosity ratio of slurry A and slurry B (viscosity of slurry A / viscosity of slurry B) is 0.1 to 0.1. 50, a two-component type cement-based filler.
[2] The two-component type cement filler according to [1], wherein the unit volume mass of the lightweight extender is 1.0 kg/L or less, and the average particle diameter of the lightweight extender is 3 mm or less.
[3] The two-component type cement filler according to [1] or [2], wherein the cement filler is a mixture of slurry A and slurry B and has the following (a) to (d).
(a) Flow value by cylinder method specified in NEXCO test method 313 is 150 mm or more (b) Density is 1.00 to 1.53 kg/L
(c) Gelation time is 5 to 120 seconds (d) Compressive strength at 28 days is 8 N/mm 2 or more
本発明のセメント系充填材（以下、単に充填材と呼ぶ場合がある。）を用いれば、ゲル化時間の調整が容易にでき、かつ軽量増量材の使用により充填速度を高く設定しても側圧を抑制できる。 By using the cement-based filler of the present invention (hereinafter sometimes simply referred to as filler), the gelation time can be easily adjusted, and the use of a lightweight filler increases the lateral pressure even when the filling speed is set high. can be suppressed.
本発明のスラリーＡは、カルシウムアルミネート類、石膏、軽量増量材及び凝結調整剤を含有する。 Slurry A of the present invention contains calcium aluminates, gypsum, lightweight fillers, and setting modifiers.
本発明で使用するカルシウムアルミネート類は、主要化学成分としてＣａＯとＡｌ２Ｏ３を含む水和活性物質であれば何れのものでも良く、化合物、固溶体又はガラス質等として、さらにはこれらの任意の混合物が例示でき、アルミナセメントでも良い。より具体的には、例えば１２ＣａＯ・７Ａｌ２Ｏ３、ＣａＯ・Ａｌ２Ｏ３、３ＣａＯ・Ａｌ２Ｏ３、ＣａＯ・２Ａｌ２Ｏ３、ＣａＯ・６Ａｌ２Ｏ３等が挙げられる。またＣａＯとＡｌ２Ｏ３に加えて他の化学成分が加わっても良く、他の化学成分単体で、或いはＣａＯやＡｌ２Ｏ３の何れか又は両者と反応した生成物であっても良い。具体的には、例えば４ＣａＯ・３Ａｌ２Ｏ３・ＳＯ３、１１ＣａＯ・７Ａｌ２Ｏ３・ＣａＦ２、Ｎａ２Ｏ・８ＣａＯ・３Ａｌ２Ｏ３等が挙げられる。また、例示以外のＣａＯとＡｌ２Ｏ３の含有モル比となるカルシウムアルミネート類でも良く、ＣａＯとＡｌ２Ｏ３の含有モル比の値は特に制限されるものではない。カルシウムアルミネート類の粒度は、ゲル化直後の強度発現性の点から、ブレーン値で４，０００ｃｍ２／ｇ以上が好ましく、５，０００ｃｍ２／ｇ以上がより好ましい。 The calcium aluminates used in the present invention may be any hydration active substance containing CaO and Al 2 O 3 as main chemical components, and may be used as a compound, solid solution, glass, etc. An example is a mixture of these, and alumina cement may also be used. More specifically, examples include 12CaO.7Al 2 O 3 , CaO.Al 2 O 3 , 3CaO.Al 2 O 3 , CaO.2Al 2 O 3 , CaO.6Al 2 O 3 and the like. Further, other chemical components may be added in addition to CaO and Al 2 O 3 , and the other chemical components may be used alone, or may be a product obtained by reacting with either or both of CaO and Al 2 O 3 . Specifically, examples thereof include 4CaO.3Al 2 O 3 .SO 3 , 11CaO.7Al 2 O 3 .CaF 2 , Na 2 O.8CaO.3Al 2 O 3 and the like. Further, calcium aluminates having a molar ratio of CaO and Al 2 O 3 other than those illustrated may be used, and the value of the molar ratio of CaO and Al 2 O 3 is not particularly limited. The particle size of the calcium aluminates is preferably 4,000 cm 2 /g or more, more preferably 5,000 cm 2 /g or more in terms of Blaine value, from the viewpoint of strength development immediately after gelation.
本発明で使用する石膏は、天然石膏及び化学石膏を含むものである。石膏としては、例えば、無水石膏、半水石膏、二水石膏等の天然石膏の他、化学石膏等を挙げることができ、２種類以上を併用しても良い。好ましくは無水石膏を使用する。石膏は、主にエトリンガイト生成による初期強度発現性増進作用を付与するため使用される。石膏の粒度は、ゲル化直後の強度発現性の点から、ブレーン値で４，０００ｃｍ２／ｇ以上が好ましく、５，０００ｃｍ２／ｇ以上がより好ましい。石膏の使用量は、初期強度発現性の点から、スラリーＡ中のカルシウムアルミネート類１００質量部に対して、１０～４００質量部が好ましく、５０～３００質量部がより好ましく、６０～２００質量部がさらに好ましい。 The gypsum used in the present invention includes natural gypsum and chemical gypsum. Examples of the gypsum include natural gypsum such as anhydrite, hemihydrate gypsum, and dihydrate gypsum, as well as chemical gypsum, and two or more types may be used in combination. Preferably anhydrite is used. Gypsum is mainly used to enhance initial strength development through the formation of ettringite. The particle size of the gypsum is preferably 4,000 cm 2 /g or more, more preferably 5,000 cm 2 /g or more in terms of Blaine value, from the viewpoint of strength development immediately after gelation. From the viewpoint of initial strength development, the amount of gypsum used is preferably 10 to 400 parts by mass, more preferably 50 to 300 parts by mass, and more preferably 60 to 200 parts by mass, based on 100 parts by mass of calcium aluminates in slurry A. Part is more preferable.
本発明で使用する軽量増量材とは、単位容積質量が１．０ｋｇ／Ｌ 以下で実質的に水和反応しない粉粒状の材料をいい、無機系、有機系いずれのものも使用できる。例えばパーライト、発泡エチレン酢酸ビニル、発泡ポリエチレン、発泡ポリスチレン、発泡ウレタン等の樹脂系発泡材、ゴムチップ等が挙げられる。単位容積質量は、１．０ｋｇ／Ｌ より大きいと充填材の軽量化効果が小さく、また使用量も多くする必要があるため充填材の中長期強度発現性が低下する。０．０２～０．５ｋｇ／Ｌが好ましく、０．０５～０．３ｋｇ／Ｌがより好ましい。
軽量増量材の平均粒子径は３ｍｍ以下が好ましい。３ｍｍを超えるとスラリーＡとＢを混合した充填材が不均質となりやすく、充填性も損なわれやすくなる。軽量増量材の使用量は、充填材の密度及び中長期の強度発現性の点から、スラリーＡ中のカルシウムアルミネート類１００質量部に対して１０～１５０質量部が好ましく、１５～１４０質量部がより好ましい。
The lightweight filler used in the present invention refers to a granular material with a unit volume mass of 1.0 kg/L or less and which does not substantially undergo hydration reaction, and both inorganic and organic types can be used. Examples include resin foam materials such as perlite, foamed ethylene vinyl acetate, foamed polyethylene, foamed polystyrene, and foamed urethane, and rubber chips. If the unit volume mass is larger than 1.0 kg/L, the weight reduction effect of the filler will be small, and the amount used will need to be increased, resulting in a decrease in medium- to long-term strength development of the filler. It is preferably 0.02 to 0.5 kg/L, more preferably 0.05 to 0.3 kg/L.
The average particle diameter of the lightweight filler is preferably 3 mm or less. If it exceeds 3 mm, the filler obtained by mixing slurries A and B tends to become non-uniform, and the filling properties tend to be impaired. The amount of lightweight filler used is preferably 10 to 150 parts by mass, and 15 to 140 parts by mass, based on 100 parts by mass of calcium aluminates in slurry A, from the viewpoint of filler density and medium- to long-term strength development. is more preferable.
本発明で使用する凝結調整剤は、セメントに使用できるものであれば特に限定されない。例えば、クエン酸、グルコン酸、酒石酸、及びリンゴ酸等の有機酸類又はそのナトリウム塩、カリウム塩、リチウム塩、及びカルシウム塩、並びに、グルコース、マルトース、デキストリン等の糖類、アルカリ金属炭酸塩等が挙げられ、１種または２種以上を使用することができる。凝結調整剤の使用量は、スラリーＡの可使時間の確保及びゲル化直後の強度発現性の点から、スラリーＡ中のカルシウムアルミネート類１００質量部に対して、０．１～５質量部が好ましく、０．２～４質量部がより好ましい。 The setting modifier used in the present invention is not particularly limited as long as it can be used in cement. Examples include organic acids such as citric acid, gluconic acid, tartaric acid, and malic acid, or their sodium salts, potassium salts, lithium salts, and calcium salts, sugars such as glucose, maltose, and dextrin, and alkali metal carbonates. One type or two or more types can be used. The amount of setting modifier to be used is 0.1 to 5 parts by mass based on 100 parts by mass of calcium aluminates in slurry A, from the viewpoint of ensuring the pot life of slurry A and developing strength immediately after gelation. is preferable, and 0.2 to 4 parts by mass is more preferable.
本発明で使用する分離低減剤は、セメントに使用できるものであれば特に限定されない。例えば、水溶性セルロース系セルロース系やアクリル系水溶性高分子、バイオポリマー、グルカン、水溶性ポリサッカライド、ベントナイト等が挙げられる。分離低減剤の使用量は、スラリーＡとスラリーＢ混合後の充填材の粘度への影響の点から、スラリーＡ中のカルシウムアルミネート類１００質量部に対して、０．２～１０質量部が好ましく、０．２～７質量部がより好ましい。 The separation reducing agent used in the present invention is not particularly limited as long as it can be used in cement. Examples include water-soluble cellulose-based cellulose-based and acrylic-based water-soluble polymers, biopolymers, glucans, water-soluble polysaccharides, bentonite, and the like. The amount of separation reducing agent to be used is 0.2 to 10 parts by mass per 100 parts by mass of calcium aluminates in slurry A, in view of the effect on the viscosity of the filler after mixing slurry A and slurry B. It is preferably 0.2 to 7 parts by mass, and more preferably 0.2 to 7 parts by mass.
スラリーＡのカルシウムアルミネート類、石膏、軽量増量材及び凝結調整剤と含有水の質量比（水／粉体比）は、スラリーＡの施工性及び充填材の初期強度発現性の点から、０．５～１．５が好ましく、０．７～１．４がより好ましい。 The mass ratio (water/powder ratio) of calcium aluminates, gypsum, lightweight filler, and setting modifier to water contained in slurry A is 0 from the viewpoint of workability of slurry A and initial strength development of the filler. .5 to 1.5 is preferable, and 0.7 to 1.4 is more preferable.
本発明の充填材のスラリーＢはセメントを含有する。 The filler slurry B of the present invention contains cement.
本発明で使用するセメントとしては、普通、早強、超早強、低熱、中庸熱等の各種ポルトランドセメン、高炉、フライアッシュ等の各種混合セメント等の公知のセメントが挙げられる。ゲル化時間の調整が容易であること、及び初期強度発現性の点から、普通、早強、高炉セメントを使用することが好ましい。 Examples of the cement used in the present invention include known cements such as ordinary, early-strength, ultra-early-strength, low-heat, and moderate-heat Portland cements, and various mixed cements such as blast furnace and fly ash. It is preferable to use ordinary, early-strength, or blast-furnace cement from the viewpoint of easy adjustment of gelation time and early strength development.
スラリーＢのセメントと含有水の質量比（水／粉体比）は、スラリーＢの流動性及び充填材の中長期の強度発現性の点から、０．４～１．５が好ましく、０．４５～１．４がより好ましい。 The mass ratio of cement to water contained in slurry B (water/powder ratio) is preferably 0.4 to 1.5, and 0.4 to 1.5, from the viewpoint of fluidity of slurry B and medium- to long-term strength development of the filler. 45 to 1.4 is more preferable.
本発明のスラリーＡ及びスラリーＢには、注入性状やそれぞれのスラリーの可使時間、さらには注入充填後の強度発現性等に支障を及ぼさない範囲で、必要によりモルタル・コンクリート用の公知の混和剤、例えば、減水剤、消泡剤、膨張材、収縮低減剤、防錆剤、有機繊維、無機繊維、顔料等を配合することができる。 Slurry A and slurry B of the present invention may contain known admixtures for mortar and concrete, if necessary, within a range that does not affect the pouring properties, pot life of each slurry, and strength development after pouring. Agents such as water reducing agents, antifoaming agents, swelling agents, shrinkage reducing agents, rust preventive agents, organic fibers, inorganic fibers, pigments, etc. can be blended.
本発明の充填材は、スラリーＡとスラリーＢを混合した２液タイプのセメント系充填材である。２液の容積比は、所望の強度発現性とゲル化時間を確保するため、スラリーＡ：スラリーＢ＝１０：９０～６０：４０となるように混合することが好ましい。より好ましくは、スラリーＡ：スラリーＢ＝１５：８５～５０：５０である。 The filler of the present invention is a two-liquid type cement-based filler made by mixing slurry A and slurry B. The volume ratio of the two liquids is preferably slurry A:slurry B=10:90 to 60:40 in order to ensure desired strength development and gelation time. More preferably, the ratio of slurry A:slurry B is 15:85 to 50:50.
本発明の充填材は、スラリーＡの粘度が８５００ｍＰａ・s 以下である。８５００ｍＰａ・ｓを超えると、スラリーＡとＢを混合させた充填材の均質性が低下しやすくなるため、長い混合時間を必要とする。より好ましい粘度は８０００ｍＰａ・ｓ以下、さらに好ましくは７５００ｍＰａ・ｓ以下である。一方、スラリーＢの粘度が２５００ｍＰａ・s 以下である。２５００ｍＰａ・ｓを超えると、スラリーＡとＢを混合させた充填材の流動性が低下しやすくなるため、充填性が低下する。より好ましい粘度は２０００ｍＰａ・ｓ以下、さらに好ましくは１５００ｍＰａ・ｓ以下である。 In the filler of the present invention, the viscosity of slurry A is 8500 mPa·s or less. When the pressure exceeds 8500 mPa·s, the homogeneity of the filler obtained by mixing slurries A and B tends to deteriorate, so a long mixing time is required. A more preferable viscosity is 8000 mPa·s or less, and even more preferably 7500 mPa·s or less. On the other hand, the viscosity of slurry B is 2500 mPa·s or less. When it exceeds 2500 mPa·s, the fluidity of the filler made by mixing slurries A and B tends to decrease, resulting in a decrease in filling properties. A more preferable viscosity is 2000 mPa·s or less, and even more preferably 1500 mPa·s or less.
また、本発明の充填材は、スラリーＡとスラリーＢの粘度比（スラリーＡの粘度／スラリーＢの粘度）が、０．１～５０である。スラリーＡの粘度が８５００ｍＰａ・s 以下、スラリーＢの粘度が２５００ｍＰａ・s 以下であっても、粘度比が０．１未満あるいは５０を超えると、スラリーＡとスラリーＢの粘度の差が大きいため、混合させた充填材の均質性が低下したり、長い混合時間を必要とする。より好ましい粘度比は０．２～４０、さらに好ましくは０．３～３０である。 Further, in the filler of the present invention, the viscosity ratio of slurry A and slurry B (viscosity of slurry A/viscosity of slurry B) is 0.1 to 50. Even if the viscosity of slurry A is 8,500 mPa・s or less and the viscosity of slurry B is 2,500 mPa・s or less, if the viscosity ratio is less than 0.1 or exceeds 50, the difference in viscosity between slurry A and slurry B will be large. The homogeneity of the mixed filler may be reduced or a long mixing time may be required. The viscosity ratio is more preferably 0.2 to 40, and even more preferably 0.3 to 30.
本発明の充填材は、（ａ）ＮＥＸＣＯ試験方法３１３に定められたシリンダー法によるフロー値が１５０ｍｍ以上であることが好ましい。フロー値が１５０ｍｍ未満の場合、覆工コンクリートや補修用型枠内への充填性が低下しやすく、側圧が局所的に上昇しやすくなる。より好ましいフロー値は、１６０ｍｍ～１０００ｍｍであり、さらに好ましくは１７０ｍｍ～７５０ｍｍである。 The filler of the present invention preferably has a flow value of 150 mm or more according to the cylinder method defined in (a) NEXCO Test Method 313. If the flow value is less than 150 mm, the ability to fill the lining concrete or repair formwork tends to decrease, and the lateral pressure tends to increase locally. More preferred flow values are 160 mm to 1000 mm, and even more preferably 170 mm to 750 mm.
本発明の充填材は、（ｂ）密度が１．００～１．５３ｋｇ／Ｌであることが好ましい。密度が１．００未満の場合、中長期の強度発現性が十分でなく、密度が１．５３を超える場合は、軽量化が十分でないため、測圧が大きくなったり、充填速度を低く設定する必要が生じる虞がある。より好ましい密度は１．０５～１．５０ｋｇ／Ｌである。 The filler of the present invention preferably has (b) a density of 1.00 to 1.53 kg/L. If the density is less than 1.00, medium- to long-term strength development is insufficient, and if the density exceeds 1.53, weight reduction is not sufficient, so pressure measurement may become large or the filling speed may be set low. There is a possibility that the need may arise. A more preferable density is 1.05 to 1.50 kg/L.
本発明の充填材は、（ｃ）ゲル化時間が５～１２０秒であることが好ましい。ゲル化時間が１２０秒を超える場合、注入充填時の側圧が大きくなったり、充填材が型枠から流出しやすくなったりする虞がある。また、スラリーＡとＢを均質に混合させるためには、ゲル化時間は５秒以上が好ましい。より好ましいゲル化時間は、５～１００秒であり、さらに好ましくは５～９０秒である。 The filler of the present invention preferably has (c) a gelling time of 5 to 120 seconds. If the gelation time exceeds 120 seconds, there is a risk that the lateral pressure during injection and filling may increase or the filler may easily flow out of the mold. Moreover, in order to mix slurries A and B homogeneously, the gelation time is preferably 5 seconds or more. The gelation time is more preferably 5 to 100 seconds, and even more preferably 5 to 90 seconds.
本発明の充填材は、（ｄ）材齢２８日の圧縮強度が８Ｎ／ｍｍ２以上である。８Ｎ/ｍｍ２未満の場合、車両通過時に発生する風圧や振動、地山からの湧水等の影響により耐久性が低下しやすくなる。より好ましい材齢２８日の圧縮強度は１０Ｎ／ｍｍ２以上である。 The filler of the present invention has (d) a compressive strength of 8 N/mm 2 or more at 28 days of age. If it is less than 8 N/mm 2 , durability tends to decrease due to the effects of wind pressure and vibrations generated when vehicles pass, spring water from the ground, etc. A more preferable compressive strength at 28 days of age is 10 N/mm 2 or more.
本発明のセメント系充填材を用いれば、軽量化により従来よりも充填速度をより高く設定することができ、施工効率を高めることが出来るため、施工時間が限られる既設トンネル内の空隙部又は補修用型枠に充填するための充填材として有用である。また、緊急工事等にも適する。 By using the cement-based filler of the present invention, the filling speed can be set higher than before due to the weight reduction, and construction efficiency can be increased. It is useful as a filler for filling molds. It is also suitable for emergency construction, etc.
以下、実施例により本発明を具体的に詳しく説明する。 EXAMPLES Hereinafter, the present invention will be specifically explained in detail with reference to Examples.
以下に示すＡ～Ｈから選定される材料を表１の配合割合となるようスラリーＡ及びスラリーＢを作液した。即ち、本発明のセメント系充填材は、カルシウムアルミネート類、石膏、軽量増量材、分離低減剤、凝結調整剤及び水からなるスラリーＡとセメント及び水からなるスラリーＢを表１に示す質量比で作液した。作液したスラリーＡ及びスラリーＢの粘度をそれぞれ測定後、両スラリーをハンドミキサー（回転数１０００ｒｐｍ）で５秒間混合し、充填材の密度、フロー値、ゲル化時間、均質性、圧縮強度を測定した。結果を表２に記す。 Slurry A and slurry B were prepared using materials selected from A to H shown below in the mixing ratios shown in Table 1. That is, the cementitious filler of the present invention has a mass ratio of slurry A consisting of calcium aluminates, gypsum, lightweight filler, separation reducing agent, setting modifier, and water to slurry B consisting of cement and water as shown in Table 1. The solution was made with After measuring the viscosity of slurry A and slurry B, both slurries were mixed for 5 seconds using a hand mixer (rotation speed: 1000 rpm), and the density, flow value, gelation time, homogeneity, and compressive strength of the filler were measured. did. The results are shown in Table 2.
＜使用材料＞
Ａ；カルシウムアルミネート類；カルシウムアルミネート（１２ＣａＯ・７Ａｌ２Ｏ３組成のガラス、ブレーン値５，５００ｃｍ２／ｇ、試製品）
Ｂ；石膏；II型無水石膏（セントラル硝子株式会社製、ブレーン値７，０００ｃｍ２／ｇ）
Ｃ；軽量増量材１；太平洋パーライト４号（太平洋マテリアル株式会社製、単位容積質量０.２ｋｇ／Ｌ、平均粒子径１ｍｍ）
Ｄ；軽量増量材２；ＥＶＡ発泡体（三福工業株式会社製、単位容積質量０.０７ｋｇ／Ｌ、平均粒子径１ｍｍ）、エチレン酢酸ビニル共重合体系
Ｅ；分離低減剤１；ＳＴＡＲＶＩＳ ３０４０Ｆ（ＳＫＷイーストアジア株式会社製）、高分子ポリマー系
Ｆ；分離低減剤２；ビスコトップＵＴ（花王株式会社製）、ポリエーテル系特殊界面活性剤
Ｇ；凝結調整剤；クエン酸（市販試薬）と炭酸ナトリウム（市販試薬）を等量混合
Ｈ；セメント；普通ポルトランドセメント（太平洋セメント株式会社製、ブレーン値３，２００ｃｍ２／ｇ）
<Materials used>
A: Calcium aluminates; Calcium aluminate (glass with 12CaO・7Al 2 O 3 composition, Blaine value 5,500 cm 2 /g, trial product)
B: Gypsum: Type II anhydrite (manufactured by Central Glass Co., Ltd., Blaine value 7,000 cm 2 /g)
C; Light weight filler 1; Taiheiyo Pearlite No. 4 (manufactured by Taiheiyo Materials Co., Ltd., unit volume mass 0.2 kg/L, average particle diameter 1 mm)
D: Light weight extender 2: EVA foam (manufactured by Sanpuku Kogyo Co., Ltd., unit volume mass 0.07 kg/L, average particle diameter 1 mm), ethylene vinyl acetate copolymer system E: Separation reducing agent 1: STARVIS 3040F (SKW (manufactured by East Asia Co., Ltd.), polymer system F; separation reducing agent 2; Viscotop UT (manufactured by Kao Corporation), polyether-based special surfactant G; coagulation modifier; citric acid (commercially available reagent) and sodium carbonate Mix equal amounts of (commercially available reagent) H; Cement; Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd., Blaine value 3,200 cm 2 /g)
＜試験方法＞
（１）粘度試験；作液したスラリーを５００ｍｌビーカーに入れ、デジタル粘度計ＲＢ－８０Ｈ（東機産業株式会社）を用いてスピンドル（Ｈ－３）回転開始から３０秒後の粘度を測定した。
（２）フロー値；両スラリーを混合して作製した充填材をＮＥＸＣＯ試験方法３１３－１９９９に定められたシリンダー法に準じて測定した。
（３）密度；両スラリーを混合して作製した充填材をＪＩＳ Ａ １１７１：２０００の「単位容積質量試験方法」に準じて測定した。
（４）ゲル化時間；両スラリーを混合して作製した充填材をカップに移し、混合してからカップを傾倒しても流れなくなるまでをゲル化時間とした。
（５）均質性；直径５ｃｍ、高さ１０ｃｍのアクリルモールドに両スラリーを混合して作製した充填材を投入し、１時間後に上下に２等分に切断して成形し、各々の供試体密度を測定した。上下供試体の密度比が０．９～１．１の場合、均質性評価を「良」とした。
（６）圧縮強度；両スラリーを混合して作製した充填材を直径５ｃｍ、高さ１０ｃｍのアクリルモールドに成形して、ＪＩＳ Ａ １２１６「土の一軸圧縮試験方法」に準じて材齢２８日で測定した。
<Test method>
(1) Viscosity test: The prepared slurry was placed in a 500 ml beaker, and the viscosity was measured 30 seconds after the spindle (H-3) started rotating using a digital viscometer RB-80H (Toki Sangyo Co., Ltd.).
(2) Flow value: The filler prepared by mixing both slurries was measured according to the cylinder method specified in NEXCO Test Method 313-1999.
(3) Density: The filler prepared by mixing both slurries was measured according to JIS A 1171:2000 "Unit volume mass test method".
(4) Gelling time: The gelling time was defined as the period from when the filler prepared by mixing both slurries was transferred to a cup and when the cup stopped flowing even if the cup was tilted.
(5) Homogeneity: The filler prepared by mixing both slurries was put into an acrylic mold with a diameter of 5 cm and a height of 10 cm. After 1 hour, the filler was cut into two equal parts vertically and molded, and the density of each specimen was determined. was measured. When the density ratio of the upper and lower specimens was 0.9 to 1.1, the homogeneity evaluation was rated as "good".
(6) Compressive strength: The filler prepared by mixing both slurries was molded into an acrylic mold with a diameter of 5 cm and a height of 10 cm, and the material was tested at 28 days old according to JIS A 1216 "Unconfined compression test method for soil". It was measured.
表２の結果から、軽量増量材、分離低減剤を含まない場合（比較例１、２）、スラリーＡあるいはスラリーＢの粘度が高すぎる場合（比較例３、４）、スラリーＡ/スラリーＢの粘度比が、０．１よりも小さい場合、あるいは５０よりも大きい混合（比較例５、６）は、スラリーＡとＢを混合した充填材の密度が高く軽量化が不十分であったり、フローが小さかったり、均質性が不良のため圧縮強度も低い結果となった。これに対し、本発明の充填材（実施例１～９）は、フローが大きく、密度も小さく、均質性も良好であり、硬化後の強度発現も良好であることが分かる。
From the results in Table 2, it can be seen that when no lightweight filler or separation reducing agent is included (Comparative Examples 1 and 2), when the viscosity of slurry A or slurry B is too high (comparative examples 3 and 4), when slurry A/slurry B is When the viscosity ratio is smaller than 0.1 or larger than 50 (Comparative Examples 5 and 6), the density of the filler obtained by mixing slurries A and B is high, and the weight reduction is insufficient, or the flow The compressive strength was also low due to the small size and poor homogeneity. In contrast, it can be seen that the fillers of the present invention (Examples 1 to 9) have a large flow, low density, good homogeneity, and good strength development after curing.
Claims (3)
（ａ）ＮＥＸＣＯ試験方法３１３に定められたシリンダー法によるフロー値が１５０ｍｍ以上
（ｂ）密度が１．００～１．５３ｋｇ／Ｌ
（ｃ）ゲル化時間が５～１２０秒
（ｄ）材齢２８日の圧縮強度が８Ｎ／ｍｍ２以上 The two-component type cement-based filler according to claim 1 or 2, wherein the cement-based filler obtained by mixing slurry A and slurry B comprises the following (a) to (d).
(a) Flow value by cylinder method specified in NEXCO test method 313 is 150 mm or more (b) Density is 1.00 to 1.53 kg/L
(c) Gelation time is 5 to 120 seconds (d) Compressive strength at 28 days is 8 N/mm 2 or more
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001214163A (en) | 1999-11-25 | 2001-08-07 | Nippon Chem Ind Co Ltd | Cave back-filling filler material for repair, filling process using the same and its cured product |
| JP2015224156A (en) | 2014-05-27 | 2015-12-14 | デンカ株式会社 | High fluidity lightweight mortar composition and high fluidity lightweight mortar using the same |
| JP2019116403A (en) | 2017-12-27 | 2019-07-18 | 株式会社菱晃 | Back-filling material for fixing inner lining of pipe, and application method of back-filling material for fixing inner lining of pipe |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001214163A (en) | 1999-11-25 | 2001-08-07 | Nippon Chem Ind Co Ltd | Cave back-filling filler material for repair, filling process using the same and its cured product |
| JP2015224156A (en) | 2014-05-27 | 2015-12-14 | デンカ株式会社 | High fluidity lightweight mortar composition and high fluidity lightweight mortar using the same |
| JP2019116403A (en) | 2017-12-27 | 2019-07-18 | 株式会社菱晃 | Back-filling material for fixing inner lining of pipe, and application method of back-filling material for fixing inner lining of pipe |
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